Stars and Black Holes Crossword

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Across
  1. 4. the star around which the earth orbits
  2. 8. An astrophysical phenomenon that occurs when the crust of a neutron star undergoes a sudden shifting
  3. 9. the distance that light travels in one year
  4. 10. an independent agency of the U.S. federal government responsible for the civilian space program
  5. 11. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter
  6. 13. 3 to 20 times the mass of our Sun
  7. 16. The study of the interaction between matter and electromagnetic radiation
  8. 17. our galaxy
  9. 18. any star of average or low luminosity, mass, and size
  10. 22. the closest and most well-known yellow hypergiant
  11. 23. in between stellar-mass and supermassive
  12. 24. a physical quantity that expresses hot and cold
  13. 25. a star with substantially larger radius and luminosity than a main-sequence star of the same surface temperature
  14. 26. a very large star that is even brighter than a giant, often despite being relatively cool
  15. 27. powers a star for most of its life
  16. 29. the parallax of one arcsecond
Down
  1. 1. a celestial object, thought to be a rapidly rotating neutron star, that emits regular pulses of radio waves and other electromagnetic radiation
  2. 2. black holes with millions to billions of times the mass of our Sun
  3. 3. the total amount of energy by a star, galaxy, or other astronomical object emitted per unit of time
  4. 5. a powerful and luminous stellar explosion
  5. 6. the apparent change in the position of a star due to the motion of the Earth
  6. 7. a region of space having a gravitational field so intense that no matter or radiation can escape
  7. 8. the elements that stars absorb
  8. 12. The process by which a star changes during its lifetime
  9. 14. an expert in or student of astronomy
  10. 15. an extremely rare, extraordinarily massive, dynamically unstable star with an enormous luminosity
  11. 19. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
  12. 20. a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure
  13. 21. measure of the brightness of a star or other celestial body
  14. 28. fixed luminous point in the night sky which is a large, remote incandescent body like the sun